<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">

<head>
    <!-- <meta charset="UTF-8"> -->
    <!-- <meta name="viewport" content="width=device-width, initial-scale=1.0"> -->
    <!-- <meta http-equiv="X-UA-Compatible" content="ie=edge"> -->
    <title>Document</title>
    <!-- 这是注释 -->
    <!-- [if IE]>
    <script>alert("条件注释");</script>
    <![endif] -->
</head>

<body>

</body>

</html>